You're on a good run, congratulations. But indeed, with a medium-sized stadium and no millions in the account, it will be impossible to survive one league higher. Of course it's also a bit of fun to get a taste of the top flight, go for it and good luck, man. I’m rooting for teams in our league.
I'm sitting soon on almost 10 million myself, but I'll wait until my trainees have a bit more volume, most likely two more seasons. I barely survied without cash the five seasons I was up there.